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(15) In the extreme case that our body is unable to absorb vitamin B12, either from food or through a supplement, it is possible that we will need B12 in injectable form, which will be decided by our doctor.(15) Side effects In most cases, taking it is considered safe , as it is a water-soluble vitamin, thus its excess is excreted in the urine

Summary For labs and procurement teams sourcing this compound, the decision should come down to documentation and supplier transparency, not marketing language

However, the absence of FDA approval for any medical indication, limited large-scale trials, and variability in product formulations underscore the need for caution [10, 11]

The main difference comes down to: Preservative vs no preservative

B12 Injections are suitable for individuals experiencing fatigue, those with vitamin B12 absorption issues, or anyone seeking to improve their energy levels and metabolic function

V., Goldner, R